public class Test3_2 {
  public static void main(String[] args) {
 // 实例化Circle类，设置半径为3
   Circle circle = new Circle(3);

 // 获取周长和面积
   double circumference = circle.getCircumference();
   double area = circle.getArea();

  // 保留两位小数并输出，用逗号隔开
  System.out.printf("%.2f,%.2f\n", circumference, area);
 }
}
